Quotes from book
Methuselah's Children

Methuselah's Children is a science fiction novel by American writer Robert A. Heinlein. Originally serialized in Astounding Science Fiction in the July, August, and September 1941 issues, it was expanded into a full-length novel in 1958.

“Life is short, but the years are long.”
Part of the secret "call and response" codewords by which members of the long-lived Howard Families can identify others:
: Life is short.
But the years are long.
Not while the evil days come not.
Methuselah's Children (1958)

“A committee is the only known form of life with a hundred bellies and no brain.”
Methuselah's Children (1958)

“Yes, maybe it’s just one colossal big joke with no point to it.”
Lazarus stood up and stretched and scratched his ribs. “But I can tell you this, Andy, whatever the answers are, here’s one monkey that’s going to keep on climbing, and looking around him to see what he can see, as long as the tree holds out.”
Methuselah’s Children (p. 667; closing words)
Short fiction, The Past Through Tomorrow (1967)

“What course of action do you favor?”
“Me? Why, none. Mary, if there is any one thing I have learned in the past couple of centuries, it’s this: These things pass. Wars and depressions and Prophets and Covenants—they pass. The trick is to stay alive through them.”
Methuselah’s Children (p. 539)
Short fiction, The Past Through Tomorrow (1967)